Swingletree safety-socket.



W. G. GRAHAM. SWINGLE'IREE SAFETY SOCKET. APPLICATION FILED SEPT. 26,1908.

Patented May 18, 1909.

WITN SSES INVENTOR MBW UNIT SaTAEEi WILLIAM GEORGE GRAHAM, OF WINNIPEG,MANITOBA, CANADA.

SWINGLETREE SAFETY- 00K131.

- Specification of Letters Patent.

Application filed September 26, 1908.

Patented May 18, 1909.

Serial No; 45 L9 2? To all whom it may concern:

Be it known hat I, WILLIAM Gnoner. GRA- HAM, of the city of il innipeg,in the Province of Manitoba, Canada, have invented certain new anduseful Improvements in Swingletre Safety-Sockets, of which the followingis the specification.

lriy invention relates to sockets especially to those applied to swingleor double trees for receiving the tugs of the ordinary harness, and theobject of the invention is to provide a safety attachment on the socketwhicl'r will effectually prevent the tug from becoming disattached fromthe socket when in use.

A further object is to provide an attachment of this kind which issimple and easily operated and which is constructed so as to allow it tobe manufactured at a reasonable cost.

My invention consists essentially in a socket having a T-shapedextending end, an L-shaped locking pin pivoted to the socket and adaptedto engage with the T-shaped end, and an extending spring secured to thepin and engaging with the socket, the parts being arranged andconstructed as hereinafter more particularly described.

Figure 1 is a perspective view of a portion of a swingletree and thesocket with my device attached. Fig. 2 is a vertical sectional viewlongitudinally through the socket, the spring, and a portion of the pin,the pin being in what is termed a closed position. Fig. 3 is an enlargeddetailed perspective view of the locking pin detached. Fig. 4 is anenlarged detailed perspective view of the spring detached.

In the drawings like characters of reference indicate correspondingparts in each figure.

1 represents a portion of the swingle-tree to the end of which isattached in the usual manner the socket 2. The socket has an extendingT-shaped end 3 designed to receive the tug A, shown dotted, of a set ofharness in the usual manner. The end has a portion notched away at 4which is formed by first cutting the arm vertically and thenhorizontally. The body of the socket at the upper side is flattened asat 5 and a horizontal hearing face is made at 6 immediately adjoiningthe T -shaped end.

7 is a locking pin which is L-shaped in form and has a slight shoulder 8formed thereon, the portion beneath the shoulder forming a spindle 9which is received within a vertically directed opening 10 formed in thesocket. The opening 10 passes through the socket from th center of theiorizontal hearing face 6. The horizontal arm of the locking pin isnotched awa at 11 supplementary to the notched portion 4 so that whenthe pin is turned into engagement with the end 3 the notched portionsclose together forming a neat joint. The spindle 9 is squared at 12immediately beneath the shoulder.

13 is a fiat spring arched centrally and having the one end providedwith a square opening 14 and the other indented at 15, the indenturepassing in the opposite direction from that of the arch in the spring.When the spring is in position the end with the squared openin 14 isfitted to the squared portion 12 of the spindle so that when the springis turned the locking pin is rotated. When securing the portions to thesocket the s ring is first placed on the pin and the spinc le is theninserted within the opening 10 the parts being firmly secured by flaringthe end of the spindle or riveting it to the socket.

An opening 16 is formed in the socket to receive the indented portion 15of the spring when it is brought to the closed position. The extendingend of the spring is bent at 17 in any suitable manner to allow it to begripped conveniently.

In using the safety socket the tug is first placed on the T-shaped endin the ordinary way and then the spring is turned till the indentureenters the opening 16; it will be understood that there is sufficientresiliency in the spring to retain it in closed position. When thespring is locked in this manner it is im ossible for the pin to turn andconsequent ly for the tug to escape.

It will be necessary of course to rivet the pin tightly, whenmanufacturing, in order to prevent any play of the spring.

What I claim as my invention is;

1. The combination with a swingle-tree of a socket having a T-shapedhead at the end thereof, a swinging retaining arm pivotally connected tothe socket and adapted to cooperate with the T-sha ed head to hold thetrace thereon, and a eaf spring having one end rigidly connected to theretaining arm and means for locking its other end to the socket to lockthe retaining arm in locking position, substantially as described.

2. In a device of the class described the combination with theswingle-tree having an extending T-shaped end, of an L-shaped pinpivotally secured to the socket by a riveted spindle passing into andthrough the socket, the said pin" having a shoulder thereon and beingsquared beneath the shoulder; an extending arched spring having anopening in one end adapted to fit the squared portion of the pin and theother end designed to engage with the socket to hold the projecting endof the arm in engagement with the ex tending T-shaped end, as and forthe purpose specified.

3. In a device of the class described the combination With theswingle-tree of a socket having an extending T-shaped end there being aportion of such end notched away, the said socket having the bodythereof flattened at its upper side and a horizontal bearing face formedon the body portion adjacent the extending T-shaped end and beingprovided with an opening in its flattened face; an L-shaped pin, rovidedwith a supplemental notch, pivotally secured to the socket, and having ashoulder thereon with a squared portion directly beneath the shoulder,such squared portion resting on the bearing face aforesaid; and anarched spring having at one end thereof an opening fitting the squaredportion of the pin and bearing on the bearing face, and the other endformed with an indenture adapted to enter the opening provided in thesocket, as and for the purpose specified.

Signed at the city of IVinnipeg, this 10th day of August 1908.

WILLIAM GEORGE GRAHAM.

I/Vitnesses G. J. THOMSON, GERALD S. RoxBUReH.

